Try using a diesel additive Injector/ fuel system cleaner or 1 or 2 tanks This should ease carbon build up and clean out the injectors. I miss my Old 73' 220D Manual Transmission 420,000 mile and going strong when traded Great Car!!

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hi this sounds like it might be the MAF sensor may be on its way out, just looking through my technical data the only thing that would make it run this bad would be the MAF, what you will have to do is disconnect the sensor and then see if it idles better, if so then you will need to get this changed out for new one...hope this helps

It could be a part called the Idle control Valve. It regulates the Idle speed and keeps it smooth. If it is choked up with carbon gum or the little motor inside it is faulty then it will not allow enough air too pass for smooth idle. When you put your air con on the engine is under more load because it has too turn the aircon pump so it will stall. Also you have a little device on aircon cars that raise the idle a little to compensate for the extra aircon load. If this is not working it could be that.